Hitachi 37LD8800TA, Service Manual

Page: 39 / 128

39
55PD8800/37LD8800
Is the voltege less than 1V
applied to PSP4 (4)pin ?
Is the voltage over than 4V
applied to PJF1(8)pin ?
Is the voltage
applied to PJF1 (3)pin ?
(Refer to note 1)
Does the red-LED light?
Are the voltages applied to
all output pins?
(Refer to note 1)
Are the voltages
applied to all input pins from
power supply unit?
(Refer to note 1)
Power cannot be turned on (Continued)
Sub Power PWB
Check FC PWB
Yes
No
Yes
No
No
Yes
Check Power supply unit
Check FC PWB
Sub Power PWB
No
No
Yes
Yes
* Check EPGgo signal
* Check input voltages
* Check output voltages
Note 1) table of input/output
* Check Power off signal
No
Check Power supply unit
Yes
Note 2) GND(0V) is K303P of Jump wire or the frame near Subpower PWB.
* Check stand-by
* Check STB5V for FC PWB
pin No value(V)
input 10V PSP2 (9)and(12) +9.9
䌾
11.1 Power supply unit
input 24V PSP2 (5)and(6) +15.8
䌾
16.9 Power supply unit
input 5.4V PSP3 (1)to(3) +5.4
䌾
5.9 Power supply unit
input STB5V PSP4 (1) +4.8
䌾
5.5 Power supply unit
output 5.5V PJB1 (1)and(2) +5.4
䌾
5.9 Bridge madia unit
output 30V PJM1 (1) +31.3
䌾
33.6 Main PWB
output 10V PJM1 (3) +9.9
䌾
11.1 Main PWB
output 6V PJM1 (5) +5.4
䌾
5.9 Main PWB
output STB5V PJM1 (7) +4.8
䌾
5.5 Main PWB
output S3.3V PJM1 (9) +3.13
䌾
3.47 Main PWB
output 10V PJF1 (1) +9.9
䌾
11.1 FC PWB
output STB5V PJF1 (3) +4.8
䌾
5.5 FC PWB
output 6V PJF2 (1)and(2) +5.4
䌾
5.9 FC PWB
output 3.3V PJF2 (5)and(6) +3.13
䌾
3.47 FC PWB
output 1.8V PJF2 (9)to(11) +1.71
䌾
1.89 FC PWB
output 3.3V PJA1 (1) +3.13
䌾
3.47 Audio PWB
output +25V PJA1 (7)to(9) +15.8
䌾
16.9 Audio PWB
From/To
input/
output signal name
37LD8800TA/55PD8800TA
Power